A fork of Rural Dictionary
Historic translation: Old Irish, Gaelic, "Champion".
Modern translation: American-Englsih, A brash and confident individual who is intelligent and resourceful. You probably are not worthy enough to be in their presence.
I am kempion - you are not. Prove yourself to be worthy and make a gallant friend for life or prove yourslf unworthy and be ridiculed in ways you cannot fathom.